JP5971586B2 - Contact device - Google Patents

Description

  The present invention relates to a contact device.

  Conventionally, there has been proposed a switch in which a contact is accommodated in an accommodation space constituted by a body and a cap, and the contact is turned on or off by pressing a push button exposed to the outside of the cap (see, for example, Patent Document 1).

  In this switch, a fixed contact terminal having a fixed contact and a movable contact terminal having a movable contact are each formed by insert molding in a synthetic resin body. The fixed contact terminal and the movable contact terminal are fixed to the body so as to penetrate the body. One end of the fixed contact terminal and the movable contact terminal protrudes to the outside of the body, and the portion protruding to the outside of the body is a soldering terminal.

JP 2003-68164 A

  In the switch disclosed in Patent Document 1, when the fixed contact terminal and the movable contact terminal are soldered to the substrate, the solder heat applied to the fixed contact terminal and the movable contact terminal is transmitted to the body, and the resin of the body melts. There was a problem that was likely to occur. When the resin melts in the body, there is a problem that the positions of the fixed setting terminal and the movable contact terminal are easily shifted. Further, when the solder heat applied to the fixed contact terminal and the movable contact terminal escapes to the body side, the amount of heat applied for performing soldering increases, and the time required for the soldering operation increases. In that case, there is a problem that the heat escaping to the body side increases and the resin melt is more likely to occur.

  The present invention has been made in view of the above problems, and the object of the present invention is that resin melting occurs in the resin molded product that holds the terminal plate during soldering or the position of the terminal plate is shifted. An object of the present invention is to provide a contact device that suppresses the above.

The contact device of the present invention includes a container made of synthetic resin, a fixed contact, a movable contact, a first terminal plate, and a second terminal plate. The fixed contact is provided inside the container. The movable contact is provided inside the container and contacts or separates from the fixed contact. The first terminal plate is provided with the fixed contact, and is held by the container so as to penetrate the container inward and outward. The second terminal plate is electrically connected to the movable contact and is held by the container so as to penetrate the container inward and outward. At least one of the first terminal plate and the second terminal plate penetrates the terminal plate at a portion held by the device body, and a locking portion that locks the device body. A through hole is provided , and the locking portion is a protrusion protruding in the through direction of the through hole.

  In this contact device, the through hole is preferably opened to the outside through a groove provided in at least a part of the hole edge.

  According to the present invention, since the terminal plate is partially thinned by providing the through hole in the terminal plate, heat conduction through the terminal plate is suppressed, and when the terminal plate is soldered, it is added to the terminal plate. It is possible to suppress the occurrence of resin melting at the portion of the container body that holds the terminal board due to the solder heat. In addition, it is difficult for heat to escape to the inside of the container via the terminal board, so the amount of heat applied to the terminal board for soldering can be reduced, and the time required for soldering can also be shortened. It can suppress that the site | part of the container to hold | maintain is fuse | melted with a heat | fever. Furthermore, since the terminal plate is provided with a locking portion for locking with the container, the resin melted at the portion of the container that holds the terminal plate by the heat applied to the terminal plate for soldering. However, the positional deviation of the terminal board can be reduced.

The pushbutton switch of this embodiment is shown, (a) is the exploded perspective view of the principal part, (b) is the perspective view which looked at the terminal board from the back side. It is a disassembled perspective view which shows the whole structure same as the above. It is an external appearance perspective view same as the above. The state where the same cover is removed is shown, (a) is a front view, (b) is a plan view, and (c) is a right side view. It is a perspective view in the state where a cover same as the above was removed. It is a figure explaining arrangement | positioning of a terminal board same as the above. The modification example same as the above is shown, (a) is an exploded perspective view of the main part, (b) is a perspective view of the terminal board seen from the back side. It is a figure explaining arrangement | positioning of a terminal board same as the above.

  Hereinafter, an embodiment in which the contact device of the present invention is applied to a pushbutton switch whose contact is turned on or off by a push operation will be described with reference to FIGS. In the following description, the vertical and horizontal directions are defined based on the orientation shown in FIG. 4A, and the horizontal direction in FIG. 4C is described as the front-rear direction. This direction is defined for convenience of description. The direction in the actual use state is not limited to the above direction.

  The pushbutton switch body 1 includes a cap 2 and a body 3 as shown in FIGS. 2 and 3.

  The cap 2 is formed of a synthetic resin (for example, polybutylene terephthalate, PBT), and is formed in a box shape having an open bottom surface. A round hole 21 that penetrates the cap 2 in the vertical direction is provided on the upper surface of the cap 2. A peripheral wall 22 surrounding the round hole 21 is provided on the upper surface of the cap 2. The peripheral wall 22 is provided concentrically with the round hole 21.

  The body 3 is made of a molded product of synthetic resin (for example, polybutylene terephthalate, PBT), and the bottom plate portion 31 of the body 3 is formed in a rectangular plate shape having substantially the same size as the bottom portion of the cap 2. The cap 2 and the body 3 are joined together with the cap 2 placed on the upper surface of the body 3. As a method for joining the cap 2 and the body 3, a well-known method such as concave-convex fitting, adhesion or welding is used. Is done.

  As shown in FIGS. 4 and 5, two terminal plates 4 and 5 are integrally provided in the body 3 by insert molding so as to penetrate the body 3 in the vertical direction. The terminal plates 4 and 5 are made of a metal plate having a surface plated with silver. Each terminal plate 4, 5 is held on both the left and right sides of the body 3 with the thickness direction parallel to the front-rear direction and the positions aligned in the front-rear direction. One terminal plate 4 (the left side in FIG. 2) includes a terminal piece 41 projecting downward from the lower surface of the body 3 and a spring receiving piece 42 projecting upward from the upper surface of the body 3 and receiving the lower end of the return spring 7. And integrated. The other terminal plate 5 (on the right side in FIG. 2) is integrally provided with a terminal piece 51 protruding downward from the lower surface of the body 3 and a contact piece 52 protruding upward from the upper surface of the body 3. In the terminal plates 4 and 5, the held portions 43 and 53 held by the body 3 are provided with through holes 44 and 54 penetrating the held portions 43 and 53 in the thickness direction, respectively. The terminal plate 4 is integrally provided with a locking projection 45 (locking portion) that protrudes in a direction parallel to the front-rear direction by bending a part of the peripheral edge of the held portion 43 toward the rear side at a substantially right angle. Is provided. Further, the terminal plate 4 is integrally provided with a protrusion 46 protruding upward from a part of the peripheral edge of the held portion 43. Further, the contact piece 52 of the terminal plate 5 is provided with a rectangular hole 55 penetrating the terminal plate 5 in the thickness direction, and the shape of the contact piece 52 in plan view is substantially O-shaped.

  As shown in FIGS. 1, 4, and 5, on the upper surface of the bottom plate portion 31 of the body 3, the thickness direction of the spring receiving piece 42 (that is, FIG. ) In the vertical direction). The spring receiving piece 42 and the protrusion 32 are arranged so as to form a cross when viewed from above, and the spring receiving piece 42 and the protrusion 32 are inserted inside the lower end portion of the return spring 7, thereby lowering the lower end of the return spring 7. The part is positioned.

  Further, on the upper surface of the bottom plate portion 31 of the body 3, as shown in FIGS. 1 and 5, the guide plate portion 33, the insulating wall 34, and the vertical wall 35 are formed by insert molding at a portion where the contact piece 52 is exposed. It is provided integrally with the contact piece 52. The guide plate portion 33 is formed by filling the hole 55 of the contact piece 52 with resin, and constitutes a flat surface that continues from the upper side of the contact piece 52 to the lower side. The insulating wall 34 covers the left side of the contact piece 52, restricts displacement of the contact piece 52, and electrically insulates between the return spring 7 and the contact piece 52. The vertical wall 35 covers a part of the right side of the contact piece 52 and suppresses the displacement of the contact piece 52. As shown in FIGS. 1 and 6, a groove 52a is provided on the left side of the contact piece 52, and a protrusion 52b is provided on the right side. The insulating wall 34 and the protrusion 52b are respectively covered so as to cover the groove 52a and the protrusion 52b. By the resin molding of the vertical wall 35, the displacement of the contact piece 52 is further suppressed.

  Further, as shown in FIG. 2, the push button switch includes a movable block 6 that can be displaced in the vertical direction with respect to the container 1, and a return spring 7 that is a coil spring formed of a metal material having excellent elasticity and conductivity. And a cover 8.

  The movable block 6 includes a metal movable contact 61 and a push button 62 formed of a synthetic resin (for example, polybutylene terephthalate). The movable contact 61 is provided integrally with the push button 62 by, for example, insert molding.

  The movable contact 61 is formed, for example, by pressing a metal plate formed by applying gold or silver plating to the surface of a phosphor bronze plate, and includes a spring seat piece 63 and a pair of contact spring pieces 64. It is prepared as one.

  The spring seat piece 63 is held at the lower part of the push button 62 so that the thickness direction is parallel to the vertical direction, and comes into contact with the upper end portion of the return spring 7. In addition, since the spring receiving piece 42 of the terminal plate 4 is inserted into the lower end portion of the return spring 7 and the return spring 7 and the terminal plate 4 are electrically connected, the terminal plate 4 and the movable contact 61 are Are electrically connected via a return spring 7.

  The pair of contact spring pieces 64 are disposed so that the thickness direction is substantially perpendicular to the vertical direction and is opposed to each other in the front-rear direction, and the distance between the pair of contact spring pieces 64 decreases toward the right side. . The contact spring piece 64 is connected to the spring seat piece 63 at the upper edge of the left end portion, and a movable contact 64a that contacts the contact piece 52 is provided at the right end portion thereof. Each contact spring piece 64 is integrally provided with a guide piece 64b that protrudes downward from the lower edge of the right end portion of the contact spring piece 64, and each guide piece 64b moves toward the lower side. It is bent so that the interval is widened. Here, the terminal plate 4 on the left side in FIG. 2 becomes a movable side terminal plate electrically connected to the movable contact 61 via the return spring 7, and the terminal plate 5 on the right side in FIG. Becomes a normally closed terminal plate that always contacts (when not operated).

  The push button 62 is made of a synthetic resin (for example, polybutylene terephthalate, PBT) molded product. And integrated.

  The drive shaft 66 of the push button 62 is inserted into the round hole 21 of the cap 2 from below, and is exposed to the outside of the cap 2 through the round hole 21. A cover 8 made of synthetic rubber is attached to the drive shaft 66. The cover 8 has a substantially dome shape with its lower end opened, and is formed in a shape in which a lower large diameter portion 81 and an upper small diameter portion 82 are integrally connected. A hole 83 for exposing the tip of the drive shaft 66 is provided. A groove 66a into which the peripheral edge portion of the hole 83 of the cover 8 is fitted is provided on the entire peripheral surface of the drive shaft 66, and the peripheral edge portion of the hole 83 is engaged with the groove 66a. The upper part of the cover 8 moves up and down in conjunction with the up and down movement. Here, when the push button 62 is pushed downward from the home position, the cover 8 is elastically deformed so that the small diameter portion 82 enters the inside of the large diameter portion 81. The large-diameter portion 81 of the cover 8 is housed inside the peripheral wall 22 of the cap 2, and the gap between the push button 62 and the cap 2 is covered by the cover 8.

  In the state where the movable block 6 and the return spring 7 are housed inside the container 1, the lower end portion of the return spring 7 is held by the spring receiving piece 42 of the terminal plate 4 insert-molded in the body 3. Yes. The movable block 6 is disposed so as to be displaceable in the vertical direction with the drive shaft 66 being passed through the round hole 21 of the cap 2. The upper end portion of the return spring 7 is in contact with the spring seat piece 63 of the movable contact 61 held at the lower part of the push button 62, and the movable block 6 receives an upward spring force from the return spring 7. The upper part of the contact piece 52 is inserted between the pair of contact spring pieces 64 included in the movable block 6, and the contact piece 52 is sandwiched between the contact spring pieces 64. Here, from the lower edge of each contact spring piece 64, an outwardly extending guide piece 64b is integrally provided, so that when the contact piece 52 is inserted, the contact piece 52 is guided to the guide piece 64b, The contact piece 52 is reliably inserted between the pair of contact spring pieces 64.

  In a state where the push button 62 is not pushed down, the movable block 6 is moved to the upper end position of the movement range by receiving the spring force of the return spring 7. In the state where the movable block 6 is moved to the upper end position, the movable contact 64 a of each contact spring piece 64 is in contact with the contact piece 52, so that the terminal plate 4, 5 is interposed between the return spring 7 and the movable contact 61. Are in an electrically connected state (ON state).

  On the other hand, when the upper part of the push button 62 exposed from the cap 83 is pushed by the user, the push button 62 moves downward against the spring force of the return spring 7, and the movable contact 61 moves downward together with the push button 62. . When the movable contact 61 moves downward by a predetermined amount or more, the movable contact 64a of the contact spring piece 64 moves from the upper side of the contact piece 52 to the guide plate portion 33 side, so that there is a gap between the terminal plate 4 and the terminal plate 5. Switch to non-conducting state (off state).

  Thereafter, when the force to push the push button 62 downward disappears, the movable block 6 moves to the upper end position due to the spring force of the return spring 7, and the movable contact 64a of the contact spring piece 64 contacts the contact piece 52. The terminal boards 4 and 5 are switched to the conductive state (ON state).

  As described above, the pushbutton switch of the present embodiment includes the synthetic resin container 1 (consisting of the cap 2 and the body 3), the contact piece 52 (fixed contact), the movable contact 64a, and the terminal plate 5. (First terminal plate) and a terminal plate 4 (second terminal plate). The contact piece 52 is provided inside the container body 1. The movable contact 64 a is provided inside the container body 1 and contacts or separates from the contact piece 52. The terminal plate 5 is provided with a contact piece 52 and is held by the body 3 so as to penetrate the container body 1 in and out. The terminal plate 4 is electrically connected to the movable contact 64a, and is held by the body 3 so as to penetrate the body 1 in and out. The terminal plate 4 is provided with a locking projection 45 (locking portion) that locks the body 3 and a through hole 44 at a portion (held portion 43) held by the body 3.

  Thus, since the terminal plate 4 is provided with the through hole 44 and the terminal plate 4 is partially thinned, heat conduction through the terminal plate 4 is suppressed, and the terminal plate 4 is soldered. In addition, it is possible to suppress the occurrence of resin melting at the portion of the body 3 that holds the terminal plate 4 due to the soldering heat applied to the terminal plate 41. In addition, since it is difficult for heat to escape to the inside of the container body 1 via the terminal plate 4, the amount of heat applied to the terminal plate 4 for soldering can be reduced, and the time required for soldering can also be shortened. It can suppress that the site | part of the body 3 holding the terminal board 4 fuse | melts with a heat | fever. Further, since the terminal plate 4 is provided with a locking projection 45 for locking with the body 3, the resin is formed at the portion of the body 3 that holds the terminal plate 4 by heat applied to the terminal plate 4 for soldering. Even if melting occurs, the displacement of the terminal board 4 can be reduced.

  By the way, in this embodiment, the through holes 44 and 54 are provided in both of the terminal plates 4 and 5, but only the terminal plate 4 that holds the lower end portion of the return spring 7 out of the terminal plates 4 and 5 is a locking protrusion. 45 is provided. Since the terminal plate 4 receives the spring force of the return spring 7, if the portion of the body 3 that holds the terminal plate 4 is thermally deformed, the position plate is more likely to be displaced than the terminal plate 5. Since the locking projection 45 is provided, even if the spring force of the return spring 7 is applied, the displacement of the terminal board 4 is suppressed. In the present embodiment, of the first terminal plate and the second terminal plate, the locking portion is provided only on the second terminal plate, but the first terminal plate (terminal plate 5) provided with the fixed contact is provided. A locking portion may be provided, or a locking portion may be provided on both the first terminal plate and the second terminal plate.

  In the above embodiment, the peripheries of the through holes 44 and 54 provided in the terminal plates 4 and 5 are closed. However, as shown in FIGS. Each may be opened to the outside through grooves 47 and 56 provided in the section. Thereby, in the held portions 43 and 53 of the terminal plates 4 and 5, the planar shape of the peripheral portions of the through holes 44 and 54 is substantially C-shaped, and the solder heat applied to the terminal pieces 41 and 51 is transferred to the through holes 44, 51. It bypasses the peripheral part of 54 and is transmitted to the inside of the container 1. Therefore, the solder heat applied to the terminal pieces 41 and 51 of the terminal plates 4 and 5 is more difficult to escape to the inside of the container 1, and as a result, the amount of heat applied to the terminal plates 4 and 5 to melt the solder is reduced. In addition, the time for applying the solder heat to the terminal plates 4 and 5 is shortened. Therefore, when soldering heat is applied to the terminal plates 4 and 5, the heat escaping to the inside of the container body 1 through the terminal plates 4 and 5 is reduced, so that the heat of the portion holding the terminal plate 4 in the container body 1 is reduced. As a result, the displacement of the terminal plates 4 and 5 can be suppressed.

  Moreover, in said embodiment, the terminal board 5 which is a 1st terminal board, and the terminal board 4 which is a 2nd terminal board are integrally provided with the body 3 (container 1) by insert molding.

  As a result, the resin flows into the through holes of the terminal plates 4 and 5 and hardens, whereby the terminal plates 4 and 5 are firmly held by the body 3.

  Incidentally, in the above-described embodiment, the contact configuration is a normally closed type, and the terminal plate 4 on the left side in FIG. 2 becomes a movable side terminal plate electrically connected to the movable contact 61 via the return spring 7. 2 is a normally closed terminal plate with which the movable contact 61 always contacts (when not operated). The contact configuration of the pushbutton switch is merely an example, and may be a normally open contact configuration, a 1c type contact configuration having both a normally closed contact and a normally open contact with respect to the movable contact, Multiple poles may be provided.

  In the above embodiment, the push button switch has been described as an example. However, the contact device of the present invention is not limited to the push button switch, and the present invention may be applied to an electromagnetic relay whose contacts are opened and closed by an electromagnet device. Needless to say.

1 body 2 cap 3 body 4 terminal board (second terminal board)
5 Terminal board (first terminal board)
41, 51 Terminal piece 42 Spring receiving piece 43, 53 Holding part 44, 54 Through hole 45 Locking protrusion (locking part)
47, 56 Groove 52 Contact piece (fixed contact)
61 Movable contact 64a Movable contact

Claims (2)

A plastic body,
A fixed contact provided inside the vessel;
A movable contact provided inside the container and contacting or separating from the fixed contact;
A first terminal plate that is provided on the container body so that the fixed contact is provided and penetrates the container body in and out;
A second terminal plate electrically connected to the movable contact and held by the container so as to penetrate the container inward and outward;
At least one of the first terminal plate and the second terminal plate penetrates the terminal plate at a portion held by the device body, and a locking portion that locks the device body. through hole and is provided,
The contact device according to claim 1, wherein the locking portion is a protrusion protruding in a through direction of the through hole . The contact device according to claim 1, wherein the through hole is opened to the outside through a groove provided in at least a part of a hole edge .

Images